Originally the KSU was an empty box that held a slew of relays that were field installed and hand wired together by the Installer. Later iterations offered prewired relay packages (grouped by line). Still later, the relays were miniaturized and put on circuit boards. That's what you're going to see. All current KSUs have their origins with this equipment. It was the gold standard for Telephones for a generation (or three - depending how you count).
Sam
"Where are we going and why are we in this hand basket?"
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